Crank-out Window plastic piece purpose
Here's a picture of a plastic piece attached to all of my windows in my Silverback 29RE. There is one on each side of each window. However sometimes the pieces seem to be at the bottom of the window; maybe they just slid around the corner to the bottom.
The pieces seem to impede the window from fully sealing against the frame of the window that is screwed to the 5th wheel. It doesn't look like it would allow water to get in but it might allow air to circulate around the tiny gaps.
Pat & Karen
2012 CC Silverback 29RE
2013 Ford F250 Lariat, Crew Cab, Short Bed, Diesel, 4WD
Retired and trying to travel where it's warm.